FDC37C78 datasheet(9/82 Pages) SMSC

9 / 82 page

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

MISCELLANEOUS

CLOCK 1

ICLK

The

external

connection

for

parallel

resonant

MHz

crystal.

CMOS

compatible oscillator is required if crystal is

not used.

CLOCK 2

OCLK

24 MHz crystal. If an external clock is used,

this pin should not be connected.

This pin

should not be used to drive any other drivers.

7, 12, 19,

Power

VCC

Positive Supply Voltage.

6, 18, 30,

Ground

GND

Ground Supply.

BUFFER TYPE DESCRIPTIONS

Note: These values are for 3

.3V operation. See Operational Description for 3.3V/5V values.

BUFFER TYPE

DESCRIPTION

I/O12

Input/output. 12 mA sink; 6 mA source

O12

Output. 12 mA sink; 6 mA source

OD20

Open drain. 20 mA sink

OCLK

Output to external crystal

ICLK

Input to Crystal Oscillator Circuit (CMOS levels)

Input TTL compatible.

Input with Schmitt Trigger

FDC37C78 데이터시트(PDF) 9 Page - SMSC Corporation

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